<!DOCTYPE HTML>
<html lang="en">
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=394057
-->
<head>
  <title>Test for Bug 394057</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
  <style type="text/css">

  #display { background: yellow; color: black; font-family: serif; }

  </style>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=394057">Mozilla Bug 394057</a>
<table id="display"><tr><td>MmMmMm...iiiIIIlll---</td></tr></table>
<div id="content" style="display: none">
  
</div>
<pre id="test">
<script class="testbody" type="text/javascript">

/** Test for Bug 394057 **/

SimpleTest.waitForExplicitFinish();

var tableElement = document.getElementById("display");

var CC = SpecialPowers.Cc;
var CI = SpecialPowers.Ci;

var fe =
  CC["@mozilla.org/gfx/fontenumerator;1"].createInstance(CI.nsIFontEnumerator);
var serifFonts = fe.EnumerateFonts("x-western", "serif", {});
var monospaceFonts = fe.EnumerateFonts("x-western", "monospace", {});

function table_width_for_font(font) {
  tableElement.style.fontFamily = '"' + font + '"';
  var result = tableElement.offsetWidth;
  tableElement.style.fontFamily = "";
  return result;
}

var serifIdx = 0;
var monospaceIdx = 0;
var monospaceWidth, serifWidth;
monospaceWidth = table_width_for_font(monospaceFonts[monospaceIdx]);
for (serifIdx in serifFonts) {
  serifWidth = table_width_for_font(serifFonts[serifIdx]);
  if (serifWidth != monospaceWidth)
    break;
}
if (serifWidth == monospaceWidth) {
  for (monospaceIdx in monospaceFonts) {
    monospaceWidth = table_width_for_font(monospaceFonts[monospaceIdx]);
    if (serifWidth != monospaceWidth)
      break;
  }
}

isnot(serifWidth, monospaceWidth,
      "can't find serif and monospace fonts of different width");

SpecialPowers.pushPrefEnv({'set': [['font.name.serif.x-western', serifFonts[serifIdx]]]}, step2);

var serifWidthFromPref;
function step2() {
    serifWidthFromPref = tableElement.offsetWidth;
    SpecialPowers.pushPrefEnv({'set': [['font.name.serif.x-western', monospaceFonts[monospaceIdx]]]}, step3);
}
var monospaceWidthFromPref;
function step3() {
    monospaceWidthFromPref = tableElement.offsetWidth;

    is(serifWidthFromPref, serifWidth,
       "changing font pref should change width of table (serif)");
    is(monospaceWidthFromPref, monospaceWidth,
       "changing font pref should change width of table (monospace)");
    SimpleTest.finish();
}

</script>
</pre>
</body>
</html>

